mirror of
https://github.com/LeCoupa/awesome-cheatsheets.git
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48 lines
2.1 KiB
Bash
48 lines
2.1 KiB
Bash
# *****************************************************************************
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# BASICS
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# *****************************************************************************
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mysqldump -h hostname -u username -p database_name -P port > file.sql # Export database
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mysql -u username -p database_name < file.sql # Import database
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SHOW PROCESSLIST; # Show you any queries that are currently running or in the queue to run
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show status where `variable_name` = 'Threads_connected'; # Show all connected threads
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show variables like 'max_connections'; # Show maximum number of allowed connections
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SET GLOBAL max_connections = 150; ## Set new value for maximum connections (no restart needed but for permanent change update my.cnf)
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GRANT ALL PRIVILEGES ON prospectwith.* TO 'power'@'localhost' WITH GRANT OPTION; # Grant all privileges on database
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CREATE USER 'newuser'@'localhost' IDENTIFIED BY 'password'; # Create user
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mysql -u root -pmypassword -e "MY SQL QUERY" &>> query.log & disown # Run SQL query in the background
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# *****************************************************************************
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# CRUD Operations
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# *****************************************************************************
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# create
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CREATE DATABASE new_dateabase; # cerates new database
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CREATE TABLE table_name (
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col_name int # datatypes: int, varchar, char, binary, image, date, DateTime
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col_name PRIMARY KEY UNIQUE NOT NULL AUTOINCREMENT; # it will create col_name as primary key for table which is unique and not null. AUTOINCREMENT start from 1 and it will increase after every insert
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);
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# Read
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SELECT * FROM table_name; # select all columns and rows from that table
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SELECT col1, col2 FROM table_name WHERE condition; # select data which will satisfy all conditions and specific columns like col1 and col2
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# Update
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update table_name SET col = xyz WHERE condition; # It will update specific columns for rows that meet given conditions.
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# Delete
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DELETE FROM table_name WHERE condition; # it will delete all rows that meet given condition.
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DROP table_name; # delete the table from the database.
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TRUNCATE table_name; # delete all rows and free up space in the database.
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